[@ravenDivinity] I mean maybe PA starts, then some thousands of years after that a new event is pivotal enough to warrant a changing of the age and another acronym begins at 1 again. 

My reasons for that thought is that the civilizations of Ansus have the potential to be up to 60K years old, I mean A.D. is good for us IRL right now but I doubt it will last for another 48,000 years.